I used to take 1cc PIO. But some study has shown that taking vaginal prog increases the prg rate. My local RE used to give both options but now they only use vaginal, Dr check also uses vaginal. I am sure Dr.d would have no problem switching to vaginal. Then take 3 endometrin per day. If u search on pubmed.org you will the study about PIO vs. Vaginal. Call tomorrow the morning and ask to switch to endometrin. Just say u don't like the injection or some thing like that.